Do I want Wally to be The Flash while Barry is? No, I for one DO like that Barry is the only active Flash right now as TWO Flashes at the same time was annoying, I mean it's not like they're the GL Corps or anything. If Wally is Reverse-Flash they better have a good reason for it. How I would like it is if they went with a disturbed Wally who remembers everything about the previous timeline and becomes an anti-hero calling himself Zoom and ACTS like a villain to keep Barry on his toes though no one would ever be in any REAL danger because Wally still has morals and he still fights crime on the side.
Wally would still be a hero, it doesn't COMPLETELY wreck his character, and allows for a unique perspective on the hero/villain dynamic.